my Sadie is super hyper and rambunceous...she doesn't chew anything but toys surprisingly, but she does bite hands and she's now 20 weeks old...at first it was all the time and really annoying, it's been less and less often and usually a strong sturdy NO BITE will get her to stop or bringing out a spray bottle and saying NO BITE and if she doesn't listen she gets a squirt...that STOPS it altogether because she hates the squirt bottle and knows better....anyways at first it seems like it will NEVER end...but find a technique that works, stick to it over and over and over and eventually they will catch on. also, replace hands and feet with a toy and give the NO BITE command and give the toy as replacement...they'll calm down and eventually get there...
i'm also glad you have already learned a valuable lesson in dog training...WALKS WORK. taking a daily walk or even every couple days will greatly decrease the hyperactive behavior in your pet and make them calmer, more attentive, and a lot less nippy and crazy...keep doing those as much as possible, once a day is best...and she'll grow out of this phase with age and with time and training and with less energy...
now Sadie only gets bitey right before a huge bout of the Zoomies where she'll run all over the floor/couch everywhere like a maniac for a few minutes and they lay down and either chew a bully stick or just relax with me and sleep.
also BULLY STICKS are your best friend...they keep them busy chewing for hours at a time and they are 100% digestible...i get mine from AMD on here at
www.westbrookdog.com
good luck!!